The brutal, four-year strangulation of an ASX-listed infrastructure company will leave bruises on both sides of the fight.

IFM Investors has increased its stake in the toll road operator to 42 per cent after shifting 22 million shares on Friday.

50 million shares worth $250 million traded hands on Monday morning, taking the manager’s stake through the 45 per cent barrier.

The brutal, four-year strangulation of an ASX-listed infrastructure company will leave bruises on both sides of the fight.